BUILT-IN FUNCTIONS

REMOVE

remove(): Element to be deleted is mentioned using list name and element.

Syntax:

 list.remove(element)

Example:   

List = [2.3, 4.445, 3, 5.33, 1.054, 2.5]

     List.remove(3) 

     print(List) 

output:

     [2.3, 4.445, 5.33, 1.054, 2.5]

REVERSE

reverse(): Sort the given data structure (both tuple and list) in ascending order. Key and reverse_flag are not necessary parameter and reverse_flag is set to False, if nothing is passed through sorted().

Syntax:

sorted([list[,key[,Reverse_Flag]]])

 list.sort([key,[Reverse_flag]])

Example:

List = [2.3, 4.445, 3, 5.33, 1.054, 2.5]

    #Reverse flag is set True 

    List.sort(reverse=True)  

    #List.sort().reverse(), reverses the sorted list   

    print(List)         

Output:

    [5.33, 4.445, 3, 2.5, 2.3, 1.054]

LENGTH

length:Calculates total length of List.

Syntax:

len(list_name)

Example:

List = [1, 2, 3, 1, 2, 1, 2, 3, 2, 1]

  print(len(List))

output:

  10 

SORT

The sort function can be used to sort a list in ascending, descending or user defined order.

To sort the list in ascending order.

List_name.sort()

This will sort the given list in ascending order.

This function can be used to sort list of integers, floating point number, string and others.

Example:

numbers = [1, 3, 4, 2]

    # Sorting list of Integers in ascending 

    numbers.sort() 

    print(numbers) 

Output:

    [1, 2, 3, 4]

To sort the list in descending order.

list_name.sort(reverse=True)

This will sort the given list in descending order.

Example:

numbers = [1, 3, 4, 2]

   # Sorting list of Integers in descending 

numbers.sort(reverse = True)

   print(numbers) 

Output:

   [4, 3, 2, 1]

CLEAR

The clear() method removes all elements from the set.

Syntax:

set.clear()

parameters:

The clear() method doesn't take any parameters.

Return:

The clear() method doesn't return any value.

Example:

   # set of letters 

GEEK = {'g', 'e', 'e', 'k', 's'}

    print('GEEK before clear:', GEEK) 

    # clearing vowels 

    GEEK.clear() 

    print('GEEK after clear:', GEEK) 

Output:

   GEEK before clear: set(['s', 'e', 'k', 'g'])

   GEEK after clear: set([])

COUNT

count() function in an inbuilt function in python programming language that returns the number of occurrences of a substring in the given string.

Syntax:

string.count(substring, start=…, end=…)

Parameters:

The count() function has one compulsory and two optional parameters.

Mandatory paramater:

1)substring – string whose count is to be found.

Optional Parameters:

1)start (Optional) – starting index within the string where search starts.

2)end (Optional) – ending index within the string where search ends.

Return Value:

count() method returns an integer that denotes number of times a substring occurs in a given string.

Below is the Python implementation of the count() method without optional parameters:

Example:

string = "geeks for geeks"

print(string.count("geeks"))

output:

2